From 0765d97abef74727c040d2eaf9112865d59f1593 Mon Sep 17 00:00:00 2001
From: Florin Coras <fcoras@cisco.com>
Date: Wed, 18 Mar 2020 21:26:41 +0000
Subject: tcp: explicit use of timer wheel in timer apis

Type: refactor

Signed-off-by: Florin Coras <fcoras@cisco.com>
Change-Id: I06120d43c15b2fa3f437ef235bf5f83ec2beb45e
---
 src/vnet/tcp/tcp_timer.h | 105 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 103 insertions(+), 2 deletions(-)

(limited to 'src/vnet/tcp/tcp_timer.h')

diff --git a/src/vnet/tcp/tcp_timer.h b/src/vnet/tcp/tcp_timer.h
index 08516b7eec2..d34fdcb146d 100644
--- a/src/vnet/tcp/tcp_timer.h
+++ b/src/vnet/tcp/tcp_timer.h
@@ -15,8 +15,109 @@
 #ifndef __included_tcp_timer_h__
 #define __included_tcp_timer_h__
 
-#include <vppinfra/tw_timer_16t_2w_512sl.h>
-#include <vppinfra/tw_timer_16t_1w_2048sl.h>
+#include <vnet/tcp/tcp_types.h>
+
+always_inline void
+tcp_timer_set (tcp_timer_wheel_t * tw, tcp_connection_t * tc, u8 timer_id,
+	       u32 interval)
+{
+  ASSERT (tc->c_thread_index == vlib_get_thread_index ());
+  ASSERT (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID);
+  tc->timers[timer_id] = tw_timer_start_16t_2w_512sl (tw, tc->c_c_index,
+						      timer_id, interval);
+}
+
+always_inline void
+tcp_timer_reset (tcp_timer_wheel_t * tw, tcp_connection_t * tc, u8 timer_id)
+{
+  ASSERT (tc->c_thread_index == vlib_get_thread_index ());
+  if (tc->timers[timer_id] == TCP_TIMER_HANDLE_INVALID)
+    return;
+
+  tw_timer_stop_16t_2w_512sl (tw, tc->timers[timer_id]);
+  tc->timers[timer_id] = TCP_TIMER_HANDLE_INVALID;
+}
+
+always_inline void
+tcp_timer_update (tcp_timer_wheel_t * tw, tcp_connection_t * tc, u8 timer_id,
+		  u32 interval)
+{
+  ASSERT (tc->c_thread_index == vlib_get_thread_index ());
+  if (tc->timers[timer_id] != TCP_TIMER_HANDLE_INVALID)
+    tw_timer_update_16t_2w_512sl (tw, tc->timers[timer_id], interval);
+  else
+    tc->timers[timer_id] = tw_timer_start_16t_2w_512sl (tw, tc->c_c_index,
+							timer_id, interval);
+}
+
+always_inline void
+tcp_retransmit_timer_set (tcp_timer_wheel_t * tw, tcp_connection_t * tc)
+{
+  ASSERT (tc->snd_una != tc->snd_una_max);
+  tcp_timer_set (tw, tc, TCP_TIMER_RETRANSMIT,
+		 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
+}
+
+always_inline void
+tcp_retransmit_timer_reset (tcp_timer_wheel_t * tw, tcp_connection_t * tc)
+{
+  tcp_timer_reset (tw, tc, TCP_TIMER_RETRANSMIT);
+}
+
+always_inline void
+tcp_retransmit_timer_force_update (tcp_timer_wheel_t * tw,
+				   tcp_connection_t * tc)
+{
+  tcp_timer_update (tw, tc, TCP_TIMER_RETRANSMIT,
+		    clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
+}
+
+always_inline void
+tcp_persist_timer_set (tcp_timer_wheel_t * tw, tcp_connection_t * tc)
+{
+  /* Reuse RTO. It's backed off in handler */
+  tcp_timer_set (tw, tc, TCP_TIMER_PERSIST,
+		 clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
+}
+
+always_inline void
+tcp_persist_timer_update (tcp_timer_wheel_t * tw, tcp_connection_t * tc)
+{
+  u32 interval;
+
+  if (seq_leq (tc->snd_una, tc->snd_congestion + tc->burst_acked))
+    interval = 1;
+  else
+    interval = clib_max (tc->rto * TCP_TO_TIMER_TICK, 1);
+
+  tcp_timer_update (tw, tc, TCP_TIMER_PERSIST, interval);
+}
+
+always_inline void
+tcp_persist_timer_reset (tcp_timer_wheel_t * tw, tcp_connection_t * tc)
+{
+  tcp_timer_reset (tw, tc, TCP_TIMER_PERSIST);
+}
+
+always_inline void
+tcp_retransmit_timer_update (tcp_timer_wheel_t * tw, tcp_connection_t * tc)
+{
+  if (tc->snd_una == tc->snd_nxt)
+    {
+      tcp_retransmit_timer_reset (tw, tc);
+      if (tc->snd_wnd < tc->snd_mss)
+	tcp_persist_timer_update (tw, tc);
+    }
+  else
+    tcp_timer_update (tw, tc, TCP_TIMER_RETRANSMIT,
+		      clib_max (tc->rto * TCP_TO_TIMER_TICK, 1));
+}
+
+always_inline u8
+tcp_timer_is_active (tcp_connection_t * tc, tcp_timers_e timer)
+{
+  return tc->timers[timer] != TCP_TIMER_HANDLE_INVALID;
+}
 
 #endif /* __included_tcp_timer_h__ */
 
-- 
cgit 1.2.3-korg